JAVA Fundamentals

JAVA Fundamentals

1. Java uses several characters as separators, including braces and brackets. Used in things like declaration.

2. There are 6 primitive data types, including boolean and integers (and other number types).

   • Faster and easier to create than other objects, which makes them useful.

3. Variables are data placeholders that must have a specified type.

   • Includes reference type and primitive type.
   • Must have a name/identifier.
     • Must follow certain JAVA rules regarding formatting, including not being able to begin with a number or include certain characters.
     • Declare a variable by writing type first, followed by name and a semi colon.
   • Constants are variables whose values cannot be changed once assigned.

4. Computers in English use ASCII character set. However, JAVA uses Unicode.

5. Literals are used when assigning values to variables.

   • 1. Integer literals used to assign values of primitive number data types.
     • 2. Floating Point Literals include numbers with decimals, exponents, fractions, etc.
       • 3. Boolean literals assign true or false value.
         • 4. Character literals include a Unicode character in single quotes.